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. 2021 Mar 2;26(5):1331. doi: 10.3390/molecules26051331

Table 1.

Study groups and types of the prostheses used.

Group Description Clinical Presentation
Group-I (n = 35) Received a conventionally fabricated cobalt-chrome (Co-Cr) ceramic prosthesis; conventional wax up copings were converted to metal copings by the lost wax technique followed by porcelain layering. graphic file with name molecules-26-01331-i001.jpg
Group-II (n = 30) Received a Co-Cr ceramic prosthesis fabricated by a computer-aided design and computer aided manufacturing (CAD/CAM) using Sintron technology. Copings were milled from a soft pre-sintered Co-Cr alloy by CAD/CAM, sintered in a special oven and followed by porcelain layering. graphic file with name molecules-26-01331-i002.jpg
Group-III (n = 30) Received zirconia-based prostheses fabricated by the CAD/CAM technique. Zirconia was milled using the CAD/CAM system from pre-sintered zirconia blocks, sintered, and followed by porcelain layering. graphic file with name molecules-26-01331-i003.jpg

Arrows show the crown margins and gingival tissues interface.